It's only a week since BMW boss Helmut Panke unveiled the new Z4 Coupe concept at the Frankfurt motor show, and German Car Fans has already procured spy shots of the production model. As you may recall, Panke announced the new M-Coupe would most definitely go into rotation at some point, but failed to offer a hint of a timeline. Insiders say, however, the US-built Z4 CS will debut at next year's Detroit auto show in time for a mid-2006 launch. GCF reports that an M version will have the M3's 3.2-liter inline six, tuned to produce 410hp-420hp (hmm, that kind of action may be wishful thinking).